<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
// $Id$

class Page extends Think {
    // 起始行数
    public $firstRow;
    // 列表每页显示行数
    public $listRows;
    // 页数跳转时要带的参数
    public $parameter;
    // 分页总页面数
    public $totalPages;
    // 总行数
    public $totalRows;
    // 当前页数
    public $nowPage;
    // 分页的栏的总页数
    public $coolPages;
    // 分页栏每页显示的页数
    public $rollPage;
    // 分页url定制
    public $urlrule;


    /**
     * 架构函数
     * @access public
     * @param array $totalRows  总的记录数
     * @param array $listRows  每页显示记录数
     * @param array $parameter  分页跳转的参数
     */
    public function __construct($totalRows,$listRows,$p='') {

        $this->totalRows = $totalRows;
        $this->parameter = $parameter;
        $this->rollPage = C('PAGE_ROLLPAGE') ? C('PAGE_ROLLPAGE') : 2;
        $this->listRows = !empty($listRows)?$listRows:C('PAGE_LISTROWS');
        $this->totalPages = ceil($this->totalRows/$this->listRows);     //总页数
            if (!define('PAGESTOTAL')) define('PAGESTOTAL', $this->totalPages);
            $this->coolPages  = ceil($this->totalPages/$this->rollPage);
            if($p){
                $this->nowPage =$p;
                }else{
                $this->nowPage  = !empty($_GET[C('VAR_PAGE')])?intval($_GET[C('VAR_PAGE')]):1;
            }
        if(!empty($this->totalPages) && $this->nowPage>$this->totalPages) {
            $this->nowPage = $this->totalPages;
        }
        $this->firstRow = $this->listRows*($this->nowPage-1);

    }

    public function  show(){

        if($this->totalRows == 0 OR $this->listRows == 0 OR $this->totalPages <= 1){
            return '';
        }

        $urlrule =  str_replace('%7B%24page%7D','{$page}',$this->urlrule); //urldecode
        if(!$urlrule){
            $p = C('VAR_PAGE');
            $nowCoolPage      = ceil($this->nowPage/$this->rollPage);
            $url  =  $_SERVER['REQUEST_URI'].(strpos($_SERVER['REQUEST_URI'],'?')?'':"?").$this->parameter;
            $parse = parse_url($url);
            if(isset($parse['query'])) {
                parse_str($parse['query'],$params);
                unset($params[$p]);
                $urlrule   =  $parse['path'].'?'.http_build_query($params);
            }
            $urlrule = $urlrule."&".$p.'={$page}';
        }


        $pre_page = $this->nowPage-1;
        $next_page = $this->nowPage +1;

        if($this->nowPage >=$this->totalPages){
            $next_page =  $this->nowPage = $this->totalPages;
        }
        if($this->nowPage <= 1){
            $pre_page =  $this->nowPage = 1;
        }

        $output = '';
        $output .= '<a class="a1_page">'.$this->totalRows.L('page_item').'</a>';
        $output .= '<a class="first_page" onclick="'.$this->pageurl($urlrule, 1,$this->parameter).'" href="'.$this->pageurl($urlrule, 1,$this->parameter).'">'.L('first_page').'</a>';
        $output .= '<a class="previous_page" href="'.$this->pageurl($urlrule, $pre_page,$this->parameter).'">'.L('previous').'</a>';
        $show_nums = $this->rollPage*2+1;// 显示页码的个数

        if($this->totalPages <= $show_nums){
            for($i = 1;$i<=$this->totalPages;$i++){
                if($i == $this->nowPage){
                    $output .= '<span class="cur_page">'.$i.'</span>';
                }else{
                    $output .= '<a href="'.$this->pageurl($urlrule,$i,$this->parameter).'">'.$i.'</a>';
                }
            }
        }else{
            if($this->nowPage < (1+$this->rollPage)){
                for($i = 1;$i<=$show_nums;$i++){
                    if($i == $this->nowPage){
                        $output .=  '<span class="cur_page">'.$i.'</span>';
                    }else{
                        $output .= '<a href="'.$this->pageurl($urlrule,$i,$this->parameter).'">'.$i.'</a>';
                    }
                }
            }else if($this->nowPage >= ($this->totalPages - $this->rollPage)){
                for($i = $this->totalPages - $show_nums ; $i <= $this->totalPages ; $i++){
                    if($i == $this->nowPage){
                        $output .=  '<span class="cur_page">'.$i.'</span>';
                    }else{
                        $output .= '<a href="'.$this->pageurl($urlrule,$i,$this->parameter).'">'.$i.'</a>';
                    }
                }
            }else{
                $start_page = $this->nowPage - $this->rollPage;
                $end_page = $this->nowPage + $this->rollPage;
                for($i = $start_page ; $i<=$end_page ; $i++){
                    if($i == $this->nowPage){
                        $output .=  '<span class="cur_page">'.$i.'</span>';
                    }else{
                        $output .= '<a href="'.$this->pageurl($urlrule,$i,$this->parameter).'">'.$i.'</a>';
                    }
                }
            }
        }

        $output .='<a class="next_page" href="'.$this->pageurl($urlrule,$next_page,$this->parameter).'">'.L('next')."</a>";
        $output .='<a class="Last_page" href="'.$this->pageurl($urlrule,$this->totalPages,$this->parameter).'">'.L('Last_page')."</a>";
        return $output;
    }

    public function  wap_show()
    {
        if($this->totalRows == 0 OR $this->listRows == 0 OR $this->totalPages <= 1){
            return '';
        }

        $urlrule =  str_replace('%7B%24page%7D','{$page}',$this->urlrule); //urldecode
        if(!$urlrule){
            $p = C('VAR_PAGE');
            $nowCoolPage      = ceil($this->nowPage/$this->rollPage);
            $url  =  $_SERVER['REQUEST_URI'].(strpos($_SERVER['REQUEST_URI'],'?')?'':"?").$this->parameter;
            $parse = parse_url($url);
            if(isset($parse['query'])) {
                parse_str($parse['query'],$params);
                unset($params[$p]);
                $urlrule   =  $parse['path'].'?'.http_build_query($params);
            }
            $urlrule = $urlrule."&".$p.'={$page}';
        }


        $pre_page = $this->nowPage-1;
        $next_page = $this->nowPage +1;

        if($this->nowPage >=$this->totalPages){
            $next_page =  $this->nowPage = $this->totalPages;
        }
        if($this->nowPage <= 1){
            $pre_page =  $this->nowPage = 1;
        }

        $output = '';
        $output .= '<a class="previous_page" href="'.$this->pageurl($urlrule, $pre_page,$this->parameter).'">'.L('previous').'</a>';
        $show_nums = $this->rollPage*2+1;// 显示页码的个数

        if($this->totalPages <= $show_nums){
            for($i = 1;$i<=$this->totalPages;$i++){
                if($i == $this->nowPage){
                    $output .= '<span class="cur_page">'.$i.'</span>';
                }else{
                    $output .= '<a href="'.$this->pageurl($urlrule,$i,$this->parameter).'">'.$i.'</a>';
                }
            }
        }else{
            if($this->nowPage < (1+$this->rollPage)){
                for($i = 1;$i<=$show_nums;$i++){
                    if($i == $this->nowPage){
                        $output .=  '<span class="cur_page">'.$i.'</span>';
                    }else{
                        $output .= '<a href="'.$this->pageurl($urlrule,$i,$this->parameter).'">'.$i.'</a>';
                    }
                }
            }else if($this->nowPage >= ($this->totalPages - $this->rollPage)){
                for($i = $this->totalPages - $show_nums ; $i <= $this->totalPages ; $i++){
                    if($i == $this->nowPage){
                        $output .=  '<span class="cur_page">'.$i.'</span>';
                    }else{
                        $output .= '<a href="'.$this->pageurl($urlrule,$i,$this->parameter).'">'.$i.'</a>';
                    }
                }
            }else{
                $start_page = $this->nowPage - $this->rollPage;
                $end_page = $this->nowPage + $this->rollPage;
                for($i = $start_page ; $i<=$end_page ; $i++){
                    if($i == $this->nowPage){
                        $output .=  '<span class="cur_page">'.$i.'</span>';
                    }else{
                        $output .= '<a href="'.$this->pageurl($urlrule,$i,$this->parameter).'">'.$i.'</a>';
                    }
                }
            }
        }
        $output .='<a class="next_page" href="'.$this->pageurl($urlrule,$next_page,$this->parameter).'">'.L('next')."</a>";
        return $output;
    }

    public function pageurl($urlrule, $page, $array = array())
    {
        @extract($array, EXTR_SKIP);
        if(is_array($urlrule))
        {
            //$urlrules = explode('|', $urlrule);
            $urlrule = $page < 2 ? $urlrule[0] : $urlrule[1];
        }

        $url = str_replace('{$page}', $page, $urlrule);
        return $url;
    }


}